<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="box"></div>
</body>
<script src="../js/react.development.js"></script>
<script src="../js/react-dom.development.js"></script>
<script src="../js/babel.min.js"></script>
<script type="text/babel">

    
    class MyComponent extends React.Component{

        constructor( props ){
            super( props );
            this.myClick = this.myClick.bind(this);
            this.state = {
                weather: 'isHot'
            }
        }
        render(){
            return (
                
                <div>
                    <h1 onClick={this.myClick}>this is my class component</h1>
                    <h2>{ this.state.weather }</h2>
                </div>
            )
        }

        myClick(){
            let weather = this.state.weather === 'isCold'? 'isHot' : 'isCold'
            this.setState({
                weather
            });
        }
    }

    let app = (
        <div>
            <MyComponent></MyComponent>
        </div>
    )

    ReactDOM.render( app, document.getElementById('box') );

</script>
</html>